Added UploadedFileHandler to keep track of files that have already been uploaded

src/main/java/eu/crushedpixel/replaymod/registry/UploadedFileHandler.java

@@ -0,0 +1,55 @@
+package eu.crushedpixel.replaymod.registry;
+
+import net.minecraftforge.common.config.Configuration;
+import net.minecraftforge.common.config.Property;
+import org.apache.commons.io.FileUtils;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class UploadedFileHandler {
+
+    private Configuration configuration;
+
+    public UploadedFileHandler(File confDir) {
+        try {
+            File confFile = new File(confDir, "uploaded");
+            confFile.createNewFile();
+            configuration = new Configuration(confFile);
+            configuration.load();
+
+            Property uploaded = configuration.get("uploaded", "hashes", new String[0]);
+
+            configuration.save();
+        } catch(Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void markAsUploaded(File file) throws IOException {
+        String checksum = String.valueOf(FileUtils.checksumCRC32(file));
+        List<String> hashes = new ArrayList<String>(Arrays.asList(configuration.get("uploaded",
+                "hashes", new String[0]).getStringList()));
+        configuration.removeCategory(configuration.getCategory("uploaded"));
+
+        hashes.add(checksum);
+
+        configuration.get("uploaded", "hashes", hashes.toArray(new String[hashes.size()]));
+        configuration.save();
+    }
+
+    public boolean isUploaded(File file) {
+        try {
+            String checksum = String.valueOf(FileUtils.checksumCRC32(file));
+            List<String> hashes = new ArrayList<String>(Arrays.asList(configuration.get("uploaded",
+                    "hashes", new String[0]).getStringList()));
+            return hashes.contains(checksum);
+        } catch(Exception e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+}